<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog()"
            >添加分类</el-button
          >
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        border
      >
        <!-- isok模板 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>

        <!-- order模板 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" type="success" v-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag size="mini" type="warning" v-if="scope.row.cat_level === 2"
            >三级</el-tag
          >
        </template>

        <!-- opt模板 -->
        <template slot="opt" slot-scope="scope">
          <el-button
            size="mini"
            type="primary"
            icon="el-icon-edit"
            @click="showEditCateFormDialog(scope.row.cat_id)"
            >编辑</el-button
          >
          <el-button
            size="mini"
            type="danger"
            icon="el-icon-delete"
            @click="removeCateByID(scope.row.cat_id)"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[2, 3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加对话框"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed()"
    >
      <el-form
        :model="addCateForm"
        :rules="cateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- options用来指定数据源 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="parentCateProps"
            @change="parentCateChanged()"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate()">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑分类的对话框 -->
    <el-dialog
      title="编辑分类名称"
      :visible.sync="editCateDialogVisible"
      width="50%"
      @close="editCateDialogClosed()"
    >
      <el-form
        ref="editCateFormRef"
        :model="editCateFormInfo"
        :rules="cateFormRules"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateFormInfo.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类的数据列表
      cateList: [],
      // 总数据函数
      total: 0,
      // 为table-tree指定列
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name',
        },
        {
          label: '是否有效',
          // 将当前列定义为模板列
          type: 'template',
          // 模板名称
          template: 'isok',
        },
        {
          label: '排序',
          type: 'template',
          template: 'order',
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt',
        },
      ],
      //控制添加对话框的显示、隐藏
      addCateDialogVisible: false,
      // 添加分类的表单数据对象
      addCateForm: {
        //父级分类的ID，默认是一级分类
        cat_pid: 0,
        cat_name: '',
        //分类的等级，默认是一级分类
        cat_level: 0,
      },
      // 父级分类的列表
      parentCateList: [],
      // 选中的父级分类的id数组
      selectedKeys: [],
      //添加分类表单的规则
      cateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类的名称', trigger: 'blur' },
        ],
      },
      //级联选择器的props属性
      parentCateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true,
      },
      // 编辑分类对话框是否显示
      editCateDialogVisible: false,
      // 需要编辑的分类名称
      editCateFormInfo: {
        cat_id: '',
        cat_name: '',
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      //console.log(res)
      this.cateList = res.data.result
      this.total = res.data.total
    },
    //监听pagesize改变事件
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum改变事件
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击按钮，展示添加分类的对话框
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 },
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败！')
      }
      this.parentCateList = res.data
    },
    //当选择发生变化时触发这个函数
    parentCateChanged() {
      // 如果selecttedKeys数组中的length大于0，则选中了父级分类
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听对话框的关闭事件，重置表单的数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    // 显示编辑分类名称的对话框
    async showEditCateFormDialog(id) {
      const { data: res } = await this.$http.get(`categories/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类信息失败！')
      }

      this.editCateFormInfo.cat_id = res.data.cat_id
      this.editCateFormInfo.cat_name = res.data.cat_name
      this.editCateDialogVisible = true
    },
    //编辑分类名称
    editCate() {
      this.$refs.editCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.editCateFormInfo.cat_id}`,
          { cat_name: this.editCateFormInfo.cat_name }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('编辑分类名称失败！')
        }
        this.getCateList()
        this.editCateDialogVisible = false
      })
    },
    //编辑分类对话框关闭时触发
    editCateDialogClosed() {
      this.$refs.editCateFormRef.resetFields()
    },
    // 删除分类
    async removeCateByID(id) {
      const confirmRes = await this.$confirm(
        '此操作将永久删除该分类, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((err) => err)
      if (confirmRes !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败！')
      }
      this.$message.success('删除分类成功！')
      if ((this.total-1) % this.queryInfo.pagesize == 0) {
        this.queryInfo.pagenum--
      }
      this.getCateList()
    },
  },
}
</script>

<style lang="less" scoped>
.el-row {
  margin-bottom: 15px;
}
.el-cascader {
  width: 100%;
}
</style>